Zulip notifications on AWX/AAP

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Has anyone got Notifications working on AWX/AAP to send to Zulip ?

I have followed the guides and get at URL like this:

When I test the Notifier I get a 500 error

I asked ChatGPT and it said to use

This gave me some progress as I now get a 404 error

I prefer Zulip to Slack due it feels/looks/works better. I have got this working with no issues on Harbor to notify me when new Images are Pushed

I did try the Slack-Compatible Bot, which goes green on AAP when testing it, but no idea where that test message goes as I never receive it

Any help is appreciated as this is driving me nuts ;-(

I recommend posting in the #integrations channel in the Zulip development community for help.